After foiling the political ambitions of a would-be American dictator, time-traveling lovers Marta Hamilton and Marshall Grissom return to their life in the Caribbean only to confront the murder of a friend and inherit responsibility for a gutsy 10-year old boy. Throughout their unlikely and tumultuous relationship, Marta has harbored suspicions that her time-traveling companion is not being honest with her. Is Marshall really the bumbling, good-hearted klutz she has come to love and trust? Or is he the cunning, cold-blooded assassin Gillis Kerg suspects him to be? In this fifth tale of physics, lust and greed, a bizarre parallel universe and a monstrous product of artificial intelligence will impose a costly consequence requiring both Marta and Marshall to face the truth of her most haunting question: “Who are you, Marshall Grissom?”